I think that it is Campagnolo's Cambio corsa shifter. I can't tell if it's got 2 rods or 1. If it is one rod it is the rarer Paris Roubaix. Basically to shift the rider reached down to the lever on the rear brake stay which opened the quick release skewer then the other lever was turned to the direction of the cog you wanted whilst back pedalling the cranks. Once the required gear was selected the quick release was refastened. You have to remember that this was all down whilst pedaling in racing conditions .

The Gana is fitted with the one lever Campagnolo Paris to Roubaix system. The earlier two lever system is known as the Campagnolo Corsa.

First notice that the fork end or drop out has a tooth rack cut in the top of it. The axle has as a mating spline, this allows the wheel when unclamped to move backwards and forwards without getting out of line.

In the Corsa system you unclamp the axle with the top lever and then select the required gear with the lower lever whilst pedalling backwards.
The weight of the rider and forward motion automatically adjust the chain tension. The top lever is then re locked and you can pedal forward again. The shortcoming with the system is the chain tends to over tension which makes for very inefficient peddalling.

The second Paris to Roubaix was developed to over come the over tensioning and speed up gear changing. Here only one lever is used, the first part of the arc of motion opens the axle clamp, as you continue the chain moving arm is picked up and you back pedal to change sprockets. Now the cunning bit - as you close the lever the tiny ratchet and paul that can be seen in the picture is bought into play and it rotates the axle slightly forward making sure the chain is not over tensioned.

There was a final version where the chain moving arm works on the bottom of the chain so you pedal forward to select the required sprocket but these are seriously rare.

I have ridden both systems and with concentration and practice gear changing can be done reasonably quickly. The Gana with long wheel base and good fork geometary is a total joy to ride of course.

When you stop and realise that for a good many years before these appeared people like Simplex and Cyclo had what we now consider conventional systems that worked easly and perfectly you realsie Campagnolo were not always the smartest kid on the block. However then they realised the Gran Sport the best of all.

It is said that when the Italian Ace Gino Bartelli first tried the Corsa system he said "it is nearly as good as a one gear bike and not a lot heavier".
When I first tried the Corsa I rang Warren Meade and asked him how he rode his Olmo Campagnolo Corsa and he said "I usually ride it in the gear I start off on"!

My Shogun Tri-Sport weighed 10.5kg on the bathroom scales. But I thought that was too heavy as it feels really light to me so I weighed it again and it came in at 11! I'm going to stick with the first weight (or maybe buy some better scales).

"...for many people your life is not worth the effort it takes to pay attention or the extra few seconds they may need to wait before they can safely get around you."-BikeSnobNYC

Ahhh.... steel is real! you know (what this means is steel is for life, barring unforseen collisions)

Aluminium alloy is the next best thing - OK until next.... month, year, quite likely. Next decade - probably not. I've just seen an aquaintance who uses a Giant alloy MTB for his commute. It would only be 5-8 years old, tops. Frame is stuffed, cracked at the top of the seat tube. Already broken and been repaired once, now broken again . It's cactus! The only broken steel frames I've seen have been in some sort of crash or got bent and fatigued later.

1.5kg sounds reasonable for an alloy frame. looking at ride magazine, the lightest (carbon) frame you can buy off the rack comes in at ~800g, and you'll be paying thousands for the honour. i doubt you could pick up a sub 1000g alloy frame.

could i expect to find a 1500g steel frame, custom or otherwise?
how much would the lightest available (traditional geometry) 54-58cm steel frame weigh in at?

munga wrote:1.5kg sounds reasonable for an alloy frame. looking at ride magazine, the lightest (carbon) frame you can buy off the rack comes in at ~800g, and you'll be paying thousands for the honour. i doubt you could pick up a sub 1000g alloy frame.

could i expect to find a 1500g steel frame, custom or otherwise?how much would the lightest available (traditional geometry) 54-58cm steel frame weigh in at?

Excerpt from the Used Bike Buyers Guide, (it does not list the actual frame size).=>> The tubesets can be compared by weight within a family but not family to family as my source(s) often included different tubes in each set of weights, i.e. some included the fork steerer tube and fork blades.

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